Vocabulary concept

Concept URI		http://dd.eionet.europa.eu/vocabulary/aq/measurementmethod/BETA
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Definition		The instrument's primary operating mechanism is the radiometric microbalance system, which relies on changes in the strength of a beta ray beam passing through the filter paper to determine changes in particulate mass collected. A Beta Attenuation Monitor is comprised of three main components: the PM air inlet, the central instrument, and the vacuum pump.
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